CN104170450A - Wireless base station, user terminal, wireless communication method, and wireless communication system - Google Patents

Wireless base station, user terminal, wireless communication method, and wireless communication system Download PDF

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Publication number
CN104170450A
CN104170450A CN201380014587.5A CN201380014587A CN104170450A CN 104170450 A CN104170450 A CN 104170450A CN 201380014587 A CN201380014587 A CN 201380014587A CN 104170450 A CN104170450 A CN 104170450A
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China
Prior art keywords
cqi
wireless base
base station
user terminal
control signal
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CN201380014587.5A
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CN104170450B (en
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永田聪
云翔
姜宇
陈岚
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NTT Docomo Inc
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NTT Docomo Inc
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/022—Site diversity; Macro-diversity
    • H04B7/024—Co-operative use of antennas of several sites, e.g. in co-ordinated multipoint or co-operative multiple-input multiple-output [MIMO] systems
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/50—Allocation or scheduling criteria for wireless resources
    • H04W72/54—Allocation or scheduling criteria for wireless resources based on quality criteria
    • H04W72/542—Allocation or scheduling criteria for wireless resources based on quality criteria using measured or perceived quality
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0623—Auxiliary parameters, e.g. power control [PCB] or not acknowledged commands [NACK], used as feedback information
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
    • H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
    • H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
    • H04B7/0619—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal using feedback from receiving side
    • H04B7/0621—Feedback content
    • H04B7/0632—Channel quality parameters, e.g. channel quality indicator [CQI]
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
    • H04L1/0026—Transmission of channel quality indication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
    • H04L1/0036—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver
    • H04L1/0039—Systems modifying transmission characteristics according to link quality, e.g. power backoff arrangements specific to the receiver other detection of signalling, e.g. detection of TFCI explicit signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal
    • H04L1/1657—Implicit acknowledgement of correct or incorrect reception, e.g. with a moving window
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W72/00—Local resource management
    • H04W72/30—Resource management for broadcast services
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/1607—Details of the supervisory signal

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Quality & Reliability (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The purpose of the present invention is to inhibit the decline in through-put, and to reduce the overhead of a CSI feedback when applying a CoMP transmission. A wireless base station configured to be able to perform coordinated multipoint transmission/reception with regard to a user terminal, the wireless base station having a determination unit for determining a retransmission control signal that is fed back from the user terminal, and a CQI update unit for updating a CQI for coordinated multipoint transmission/reception by using the reception quality information in each cell, wherein the CQI update unit updates the CQI by using a calculation formula delimited by the reception quality information in each cell and a variable of which the numerical value changes in accordance with the content of the retransmission control signal.

Description

Wireless base station, user terminal, wireless communications method and wireless communication system
Technical field
The present invention relates to can be applicable to wireless base station, user terminal, wireless communications method and the wireless communication system of cellular system etc.
Background technology
In UMTS (universal mobile telecommunications system) network, take improve frequency efficiency, raising message transmission rate is object, adopt HSDPA (high-speed downlink packet access), HSUPA (High Speed Uplink Packet access), thereby bring into play to greatest extent the feature of the system based on W-CDMA (Wideband Code Division Multiple Access (WCDMA)).For this UMTS network, take more high data transfer rates, low delay etc. as object, studying LTE (Long Term Evolution) (non-patent literature 1).
Third generation system is utilized the roughly fixed frequency band of 5MHz, can in downgoing line, realize the transfer rate of maximum 2Mbps left and right.On the other hand, in the system of LTE, utilize the variable frequency range of 1.4MHz～20MHz, can at downgoing line, realize the transmission rate of maximum 300Mbps left and right, in uplink, realize the transmission rate of 75Mbps left and right.In addition, in UMTS network, with further broadband and high speed, turn to object, also study the follow-up system (for example, senior LTE (LTE-A)) of LTE.
In addition, in the system of LTE mode, in order to make wireless base station carry out best scheduling, user terminal reporting channel state.As for reporting the parameter of this channel status, stipulated the quality information (CQI: CQI) for the down link of adaptive modulation-demodulation and coding processing (AMC:Adaptive Modulation and Coding scheme).By contain the channel condition information (CSI:Channel State Information) of such CQI from user terminal to wireless base station feedback packet, thereby dispatch.
Prior art document
Non-patent literature
Non-patent literature 1:3GPP, TS25.912 (V7.1.0), " Feasibility study for Evolved UTRA and UTRAN ", Sept.2006
Summary of the invention
The problem that invention will solve
In addition, as being expected to one of technology LTE system further being improved systematic function, there is minizone orthogonalization.For example, in LTE-A system, uplink downlink has all been realized the orthogonalization in community by quadrature multiple access.That is,, in down link, at frequency domain, between user terminal UE (user's set), carried out orthogonalization.On the other hand, same with W-CDMA, minizone repeats interference randomization by a cell frequency substantially.
Therefore,, in 3GPP (third generation partner program), as for realizing the orthogonalized technology in minizone, just at research coordination multiple spot, send (the CoMP:Coordinated Multi-Point transmission/reception) technology of reception.At this CoMP, send in reception, to one or more user terminal UE, by a plurality of cell coordinations, sent the signal receiving and process.For example, in down link, transmission while studying the multiple sectors at same of applying precoding, coordinated scheduling/beam forming etc.By applying these CoMP, send reception technique, expect to improve the throughput characteristic of the user terminal UE that is especially positioned at cell edge.
In order to apply CoMP, send reception technique, need to wireless base station, feed back from user terminal a plurality of communities each channel condition information (for example, CQI).In addition, wireless base station utilization, from the CQI of each community of user terminal feedback, is calculated the CQI for CoMP, thereby upgrades the CoMP CQI information that (upgrading) applies in wireless base station.
When the CoMP calculating uses the precision of CQI, have the method for feeding back various information from user terminal in improving wireless base station, but now the expense of CSI feedback becomes large.On the other hand, by reducing from user terminal feedack amount, can suppress expense, but the CoMP calculating can reduce with the precision of CQI in base station apparatus, cannot effectively apply CoMP transmission reception technique, throughput can not improve.
The present invention completes in view of this point, and its object is, provides and when CoMP sends application, suppresses feedback information volume increase, and can suppress wireless base station, user terminal, wireless communications method and the wireless communication system that throughput reduces.
For solving the means of problem
Wireless base station of the present invention can be coordinated multiple spot to user terminal and send reception, it is characterized in that having: acceptance division, receives the reception quality information of each community and retransmit control signal from described user terminal; Detection unit, judges and retransmits control signal; And CQI renewal portion, the reception quality information of each community that utilization receives, upgrade for coordinating multiple spot and send the CQI receiving, described CQI renewal portion utilizes the calculating formula of the variable regulation that reception quality information and the numerical value by described each community changes according to the content of described repeating transmission control signal, upgrades CQI.
Invention effect
According to the present invention, when application CoMP sends, can both suppress feedback information volume increases, and suppresses again throughput and reduces.
Accompanying drawing explanation
Fig. 1 coordinates for illustrating the figure that multiple spot sends.
Fig. 2 means and is applied to coordinate the schematic diagram that multiple spot sends the structure of the wireless base station receiving.
The sequential chart of wireless base station when Fig. 3 means the relevant JT type CoMP of application and an example of the program between user terminal.
The figure of the determining method of the phase information (θ) of minizone when Fig. 4 is the relevant JT type CoMP of application.
Fig. 5 is for the figure of the system configuration of wireless communication system is described.
Fig. 6 is for the integrally-built figure of wireless base station is described.
Fig. 7 is the functional block diagram corresponding with the Base-Band Processing portion of wireless base station.
Fig. 8 is for the integrally-built figure of user terminal is described.
Fig. 9 is the functional block diagram corresponding with the Base-Band Processing portion of user terminal.
Embodiment
Below, with reference to accompanying drawing, describe embodiments of the present invention in detail.
First, utilize Fig. 1 to illustrate that the CoMP of down link sends.CoMP as down link sends, and has the shaping of coordinated scheduling (Coordinated Scheduling)/coordinates beam (Coordinated Beamforming) and Combined Treatment (Joint processing).It is to a user terminal UE that coordinated scheduling/coordinates beam is shaped, only Cong Yige community sends the method for sharing data channel, as shown in Figure 1A, consider interference and the interference to other communities from other communities, carry out the distribution of the Radio Resource in frequency/area of space.On the other hand, Combined Treatment is application precoding and simultaneously send the method for sharing data channel from a plurality of communities, have as shown in Figure 1B a user terminal is sent from a plurality of communities share the joint transmission (JT:Joint transmission) of data channel and as shown in Figure 1 C moment ground select Yi Ge community and send the dynamic point of sharing data channel to select (DPS:Dynamic Point Selection).
As the structure that realizes CoMP and send to receive, such as the structure (centralized control based on RRC structure) of a plurality of remote wireless devices (RRE:Remote Radio Equipment) and the structure (the autonomous decentralized control based on stand-alone base station structure) of wireless base station as shown in Figure 2 B (wireless base station eNB) that is connected to wireless base station (wireless base station eNB) by optical fiber etc. that comprise having as shown in Figure 2 A.In addition, the structure that comprises a plurality of remote wireless device RRE has been shown in Fig. 2 A, but can has been also only to comprise as shown in Figure 1 the structure of a remote wireless device RRE.
In the structure shown in Fig. 2 A (RRE structure), centralized control remote wireless device RRE1, RRE2 in wireless base station eNB.In RRE structure, carry out the base band signal process of a plurality of remote wireless device RRE and wireless base station eNB (centralized base-station) the Yu Ge community of control (, each remote wireless device RRE) between, by having utilized the baseband signal of optical fiber to connect, therefore can in centralized base-station, carry out in the lump the Radio Resource of minizone and control.That is, the delay of signaling and the problem of expense that in stand-alone base station structure, become between the wireless base station eNB of problem are little, than the Radio Resource that is easier to realize the high speed of minizone, control.Thereby, in RRE structure, in down link, can a plurality of communities of applications exploiting send the method that the signal of the minizone of such high speed is processed simultaneously.
On the other hand, in the structure shown in Fig. 2 B (stand-alone base station structure), the allocation of radio resources such as in a plurality of wireless base station eNB (or RRE), dispatch respectively and control.Now, the X2 interface between the wireless base station eNB of the eNBYu community, wireless base station 2 by community 1, sends to any wireless base station eNB by information of radio resource allocation such as timing information, scheduling as required, thereby carries out the coordination of minizone.
In the situation that application CoMP sends, wireless base station need to utilize the reception quality information in each CoMP community and calculate the CQI for CoMP, thereby upgrades the CoMP CQI information that (upgrading) applies in wireless base station.As reception quality information, thereby can enumerate, in user terminal, be generated quality information being quantized (CQI), the SINR in each community (signal is with respect to the ratio (Signal to Interference plus Noise Ratio) of interference plus noise) of being fed back to wireless base station etc.In the present embodiment, as reception quality information, can apply any, as reception quality information, be designated as in the following description " CQI ".
In addition, in the CoMP of above-mentioned joint transmission (JT) type, to user terminal, the wireless base station of Cong Ge community is at identical timed sending identical data.In addition, in the CoMP of JT type, further have: do not consider the phase information (θ) of minizone and calculate the incoherent type JT (non-coherent JT) of CQI for CoMP; And consider the phase information (θ) of minizone and calculate the phase dry type JT (coherent JT) of CQI for CoMP.
In incoherent type JT, utilize for example, reception quality information (for example, CQI1, CQI2) in a plurality of communities (Liang Ge community) and calculate CQI for CoMP (following, be designated as " CQI jT"), thereby carry out CQI jTthe renewal of information (upgrading).For example, studying CQI1 and the CQI2 of wireless base station based in each community, the formula 1 that application is following, calculates CQI jTtechnology.
[mathematical expression 1]
(formula 1)
CQI JT＝CQI1+CQI2
CQI1: the reception quality information in the strongest CoMP community of received power
CQI1: the reception quality information in the inferior strong CoMP community of received power
In addition, CQI1, CQI2 here for example can be defined as respectively the SINR of the CoMP community that the SINR of the CoMP community that received power is the highest and received power are time high.In addition, the interfering signal power in SINR can be made as CoMP and coordinate the interference outside community.Certainly, also can utilize from the CQI of user terminal feedback.
In the above-mentioned formula 1 of application, calculate CQI jTsituation under, do not consider the phase information of minizone.Therefore, in the large situation of the CQI1 in Dang Ge community and the phase difference of CQI2, the CQI calculating in wireless base station jTinaccurate (becoming the value of underestimating) becomes.Its result, the misgivings that exist throughput to reduce.On the other hand, in order to proofread and correct the phase difference of minizone, also consider to apply the method for the calculating formula of corrected value of having stipulated as following formula 2.
[mathematical expression 2]
(formula 2)
CQI JT = CQI 1 + CQI 2 + 2 * CQI 1 * CQI 2
But people's the research according to the present invention, calculates CQI even if the above-mentioned formula 2 of the impact of the phase difference of having considered minizone is applied in discovery jTsituation under, sometimes also there will be the CQI calculating in wireless base station jTthe situation of inaccurate (becoming the value of over-evaluating) becomes.
On the other hand, in order to improve the CQI in base station apparatus jTthe precision of calculated value, also consider in user terminal, calculate the composite value (CQI of the CQI (for example, CQI1 and CQI2) in each community aggregated), thereby by this composite value (CQI aggregated) feed back to the situation of wireless base station, but exist the expense of CSI feedback to become large problem.
Therefore, people of the present invention study rear discovery, the CQI calculating in wireless base station jTprecision be associated with the result of repeating transmission control signal from user terminal feedback.Specifically, the CQI calculating when wireless base station jTbe in situation about over-evaluating, retransmitting control signal becomes NACK, and when being underestimates in the situation of (or suitably evaluating), retransmitting control signal becomes ACK.Therefore, people's imagination of the present invention is as CQI jTcalculating/update method and utilize the calculating formula of the variable regulation that reception quality information in You Ge community and numerical value changes according to the content of recurrent signal, thereby reach the present application.
In addition,, in phase dry type JT, for example, except utilizing outside the reception quality information (, CQI1, CQI2) in each community, also utilize the phase information (θ) of the minizone of feeding back from user terminal to calculate CQI jTand upgrade (upgrading).That is, because consideration phase information is calculated CQI jT, therefore think and the relevant JT comparison of nothing, can calculate exactly CQI jT.
Now, in user terminal, determine phase information (θ), make the composite value (CQI of the CQI in each community aggregated) become maximum, thus this phase information to wireless base station, fed back.But people's the research according to the present invention, even find the composite value (CQI of the CQI in each community of application aggregated) become maximum phase information and calculate CQI jTsituation under, the CQI that sometimes calculated jTalso can be inaccurate, and throughput reduces.Therefore, people of the present invention find, consider the composite value (CQI of the quality information in each community in user terminal aggregated) maximum and CQI jTcalculated value and determine phase information, thereby can upgrade more accurately CQI jT.
CQI while below, describing the CoMP that applies incoherent JT type in detail jTthe CoMP of update method, the relevant JT type of application time determining method and the CQI of phase information (θ) jTupdate method.In addition, in the following description, enumerating the situation of carrying out CoMP transmission between Liao Liangge community is example, but present embodiment can be applied to carry out in more than three minizones the situation of CoMP transmission too.
(incoherent JT)
In the situation that the CoMP of the incoherent JT type of application, wireless base station utilization comprises CQI in each community (being CQI1 and CQI2) here and the calculating formula of the parameter that changes according to the content of retransmitting control signal, calculates CQI jTand upgrade.For example, the following formula 3 of the variable (β) that numerical value changes according to the content of retransmitting control signal (ACK/NACK) has been stipulated in wireless base station utilization, carries out CQI jTcalculate.
[mathematical expression 3]
(formula 3)
CQI JT = CQI 1 + CQI 2 + β * CQI 1 * CQI 2
CQI1: the reception quality information in the strongest CoMP community of received power
CQI2: the reception quality information in second strong CoMP community of received power
β: variable
So, in formula 3, to be multiplied by for the binomial theorem (Binomial theorem) of proofreading and correct the β that becomes variable when calculating the vector value sum of CQI1 and CQI2.As the β in above-mentioned formula 3, initial value can be set as to setting (for example, 2), be not completely cured and according to retransmitting the content of control signal, change the value of β.Now, can preset the scope of the desirable candidate value of β.For example, the amplitude of fluctuation (Δ β) that β is changed is made as 0.5, make its according to retransmit control signal content and-2.0～4.0 scope ([2 ,-1.5 ,-1.0 ..., 4.0]) in change.In addition, can also use the method that the integral body on the right side of above-mentioned formula is multiplied by variable β.
Wireless base station is in the situation that be " ACK " from the repeating transmission control signal of user terminal feedback, judges the CQI having set in wireless base station jTbe (or suitably) underestimated, and improve the value (or maintaining) of β.On the other hand, when the repeating transmission control signal from user terminal feedback is the situation of " NACK ", be judged as the CQI having set in wireless base station jTbe (or suitably) of over-evaluating, and reduce the value of β.
As an example, wireless base station is being set as " 2 " by the initial value of β, and is the situation of " ACK " from the repeating transmission control signal of user terminal feedback, the value of β is increased to 2.5 from 2, thereby carries out CQI jTcalculating, and upgrade CQI jTinformation.On the other hand, when being the situation of " NACK " from the repeating transmission control signal of user terminal feedback, the value of β is worth to 1.5 from 2 minimizings, thereby carries out CQI jTcalculating and upgrade CQI jTinformation.
In addition, wireless base station also can change the value of β according to the content of once retransmitting control signal from user terminal feedback, also can be made as in the situation that the repeating transmission control signal of identical content is repeatedly continuous, makes the structure of the value variation of β.In addition,, as the benchmark that changes the value of β, the continuous number of times of the number of times that ACK is continuous and NACK also can be different.As an example, can will become for a change continuous reception number of times of the ACK of the benchmark of β to be made as than the continuous reception of NACK often.
In addition, the amplitude of fluctuation (Δ β) of initial value and/or the β of β also can be considered to reset from the tendency of the repeating transmission control signal of user terminal feedback in wireless base station.
So, the calculating formula of the variable that the CQI of wireless base station utilization regulation Liao Ge community value and value change according to the result of retransmitting control signal, carries out CQI jTthe renewal of information, thereby even to CQI jTthe renewal of information is in the situation of application message, also can reduce the impact that the phase difference of minizone causes.Thus, wireless base station can carry out CQI more accurately jTthe renewal of information, can suppress throughput and reduce.Especially, by application present embodiment, even if do not feeding back the composite value (CQI of the CQI of each community from user terminal aggregated) situation under, also can carry out more accurately the CQI of wireless base station value jTcalculating/the renewal of information.
(relevant JT)
In the situation that the CoMP of the relevant JT type of application, user terminal for example,, except notifying outside the CQI (, CQI1 and CQI2) of each community, is also notified the phase information of minizone (θ) to wireless base station.On the other hand, CQI and the phase information (θ) of wireless base station based on each community, carries out CQI jTcalculate again, and carry out CQI jTthe renewal of information.
In user terminal, in the situation that determine the phase information (θ) to wireless base station feedback, the specific phase difference of user terminal selecting, makes the composite value (CQI of the CQI of each community aggregated) become maximum.But, even if determine as described above the composite value (CQI of the CQI of each community aggregated) become maximum phase information (θ) and feedback situation under, be not sometimes reflected to exactly the CQI in wireless base station yet jTcalculating.
Therefore, the user terminal of present embodiment is except considering 1) composite value (CQI of CQI in each community aggregated) maximum outside, also consider 2) CQI jTcalculating (renewal value (CQI update)) and determine phase information (θ).Specifically, user terminal can determine phase information (θ) by two following steps.
(first step)
Composite value (the CQI of the CQI of user terminal based in each community aggregated) and wireless base station in CQI jTrenewal value (CQI update), select a plurality of phase differences (phase difference candidate value).Specifically, user terminal, for each phase difference of a plurality of phase differences, obtains the composite value (CQI of CQI aggregated) and the CQI that uses of CoMP jT(renewal value (CQI update)) difference.Renewal value (CQI update) calculating can equally with wireless base station carry out.Then, in a plurality of phase differences (phase difference candidate value), select the absolute value of difference to be less than setting (phase difference XdB), here.For example, the candidate value of the poor information of 4 selected phase of the formula below user terminal utilization.
[mathematical expression 4]
(formula 4)
Ω＝|CQI (i) aggregated-CQI (i) JT|＜XdB，
0<i<2 B，
B: phase feedback bit number
In addition, the CQI that CoMP uses jT(CQI update) can be made as and in user terminal, be applied in wireless base station for calculating CQI jTformula (with reference to following formula 6).In addition,, in the situation that the formula of practical application has the variable changing according to retransmitting control signal in wireless base station, also can apply the formula different from the formula of practical application in wireless base station (for example, variable being made as to the formula of fixed value).
In addition,, in the situation that user terminal determines phase information (θ), there is following method: the candidate value (θ that presets a plurality of phase differences i) (for example, θ i=π i/2, i=0,1,2,3), user terminal is selected specific phase difference candidate value from a plurality of phase difference candidate values based on measured value.The in the situation that of application the method, can reduce the bit number (being 2 bits here) of the phase information of feedback.Now, when needing only from feedback, user terminal selectable a plurality of phase difference candidate values, selects the composite value (CQI of CQI aggregated) and the CQI that uses of the CoMP calculating in wireless base station jT(CQI update) the absolute value of difference value be less than the phase difference candidate of setting.
(the 2nd step)
Then, user terminal, from a plurality of phase difference candidate values of selecting the 1st step, determines the composite value (CQI of CQI aggregated) become maximum specific phase information (phase difference candidate value) (with reference to following formula 5).
[mathematical expression 5]
(formula 5)
θ＝argmax{CQI (i) aggregated}，i∈Ω
User terminal feeds back to wireless base station by the specific phase information determining in above-mentioned the 2nd step.
CQI (being CQI1 and CQI2 here) and the phase information (θ) of each community of wireless base station based on from user terminal feedback, carry out CQI jTcalculating, and carry out CQI jTthe renewal of information.For example, wireless base station can utilize following formula 6, carries out CQI jTcalculate again.
[mathematical expression 6]
(formula 6)
CQI JT = CQI 1 + CQI 2 + &beta; * CQI 1 * CQI 2 * cos ( &theta; )
CQI1: the reception quality information in the strongest CoMP community of received power
CQI2: the reception quality information in the CoMP community of received power the last the second
β: fixed value or variable
θ: phase information
In above-mentioned formula 6, β can be made as to fixed value (for example, 2).Now, user terminal can be to the CQI in above-mentioned the 1st step jT(CQI update) the above-mentioned formula 6 of computing application (β is fixed value (for example, 2)).
In addition,, in above-mentioned formula 6, one of them or both in β and cos (θ) can be made as to the variable changing according to the result of the repeating transmission control signal (ACK/NACK) from user terminal notice.For example, also β (for example can be made as to fixed value, 2), according to the result of retransmitting control signal, upgrade the value of cos (θ), also can be used as θ and apply from the value of UE feedback and upgrade the value of β, also can, according to the result of retransmitting control signal, upgrade respectively the value of β and cos (θ).In addition, can also apply the method that the right side integral body of above-mentioned formula is multiplied by variable β.
Now, if be " ACK " from the repeating transmission control signal of user terminal feedback, wireless base station improves (or maintaining) β and one of them of cos (θ) or both values.On the other hand, if be " NACK " from the repeating transmission control signal of user terminal feedback, can reduce one of them of β and cos (θ) or both values.
In addition, the initial value of β, interval etc. can equally with the CoMP of above-mentioned incoherent JT type be set.In addition,, about cos (θ), also can suitably set amplitude of fluctuation etc.
Below, with reference to Fig. 3, Fig. 4, illustrate when applying the CoMP of relevant JT type the CQI of the decision of the phase information of UE value and wireless base station value jTone example of the update method of information.In addition, in the following description, imagination is utilized the situation of Liang Ge community application CoMP.In addition, show user terminal selects a phase information as the situation to the phase information of wireless base station feedback from the candidate value of the phase difference (θ i=π i/2, i=0,1,2,3) of four kinds (2 bits).
First, user terminal generates the CQI (CQI1, CQI2) (ST11 of Fig. 3) of each CoMP community.Specifically, the information of user terminal based on shown in Fig. 4 A, calculates the composite value (CQI of CQI (CQI1, CQI2) in each community and the CQI corresponding with four kinds of phase differences aggregated), CoMP CQI jTrenewal value (CQI update).In Fig. 4 A, show expression for the H of the channel matrix (channel matrix) of the service point (or focal point) of user terminal 1and H 2, represent the W of the precoder (precoder) of service point (or focal point) 1and W 2, and CoMP coordinate interference outside community and the aggregate value (ICI+N of noise 0).
User terminal can be calculated the CQI (CQI1, CQI2) in each community by following formula 7, calculates the composite value (CQI of CQI by following formula 8 aggregated), and by following formula 9, calculate the renewal value (CQI of CQI update).In addition, the formula of CQI1, the CQI2 in formula 7 also can be applied to CQI1, the CQI2 of other formulas in this specification.
[mathematical expression 7]
(formula 7)
CQI 1 = | H 1 W 1 | 2 ICI + N 0 , CQI 2 = | H 2 W 2 | 2 ICI + N 0
[mathematical expression 8]
(formula 8)
CQI Aggre . ( i ) = | H 1 W 1 + H 2 W 2 e J&theta;i | 2 ICI + N 0
phase &alpha; i = e j&theta;i , j = - 1
[mathematical expression 9]
(formula 9)
CQI Update ( i ) = CQI 1 + CQI 2 + 2 * CQI 1 * CQI 2 * cos ( &theta; i )
Composite value (the CQI of CQI1, the CQI2 that Fig. 4 B represents to calculate by above-mentioned formula 7～9, the CQI corresponding with each phase difference candidate value aggregated) and CQI jTrenewal value (CQI update).Then, user terminal, based on Fig. 4 B, determines the specific phase information (ST12 of Fig. 3) to wireless base station feedback from the candidate value of a plurality of phase informations.
Here, at the composite value (CQI that only considers as in the past CQI aggregated) and in the situation of the poor information of selected phase, select the composite value (CQI of CQI aggregated) become the phase information (θ of maximum (18) 2).But, to the phase information of wireless base station feedback, be θ 2situation under, the CQI in wireless base station jTrenewal value (CQI update) reduce.That is, composite value (CQI aggregated) and renewal value (CQI update) difference become large.Now, the CQI being updated in wireless base station becomes inaccurate, if therefore wireless base station is based on this renewal value (CQI update) and carry out radio communication control, the misgivings that exist throughput to reduce.
Therefore, in the present embodiment, first user terminal selects to make the composite value (CQI of CQI aggregated) and renewal value (CQI update) the candidate value (the 1st step) of the absolute value of the difference phase information less than setting (XdB).In addition, can consider CQI jTrenewal value (CQI update) precision and the relation between throughput and set X.Then, user terminal, from the candidate value of the phase information of this selection, is selected the composite value (CQI of CQI aggregated) become maximum specific phase information (the 2nd step).
Here, user terminal selecting makes the composite value (CQI of CQI aggregated) and renewal value (CQI update) the phase information (θ that diminishes of the absolute value of difference 1) and (θ 3) (with reference to above-mentioned formula 4).Then, user terminal is from phase information (θ 1) and (θ 3) in, the composite value (CQI of selection CQI aggregated) become maximum phase information (with reference to above-mentioned formula 5).Here, due to phase information (θ 1) and (θ 3) in the composite value (CQI of CQI aggregated) identical, so the poor information (θ of selected phase 1) and (θ 3) in any.
Then, user terminal is by phase information (θ 1and θ 3in any) etc. feed back to wireless base station (ST13 of Fig. 3).In addition the repeating transmission control signal that, whether user terminal is also accurately received for the data that represent to receive from wireless base station wireless base station feedback.
CQI1, CQI2, the phase information (θ of wireless base station based in each community 1and θ 3in any), calculate CQI jTand renewal CQI jTinformation (ST14 of Fig. 3).In addition, the CQI in wireless base station jTcalculating can be undertaken by above-mentioned formula 6 grades.
So, in the present embodiment, in user terminal, consider CQI jTrenewal value (CQI update) and determine the phase information that will feed back, therefore can improve the CQI upgrading in wireless base station precision, improve throughput.
(structure of wireless communication system)
Below, describe the wireless communication system of present embodiment in detail.Fig. 5 is the key diagram of system configuration of the wireless communication system of present embodiment.In addition, the wireless communication system shown in Fig. 5 is for example LTE system or the wireless communication system that comprises SUPER3G.In this wireless communication system, utilize by using the band system band of LTE system as a plurality of fundamental frequency pieces of Yi Ge unit the carrier aggregation as one.In addition, this wireless communication system can be called as IMT-Advanced, also can be called as 4G.
As shown in Figure 5, wireless communication system 1 comprises wireless base station 20A, 20B, communicates with this wireless base station 20A, 20B a plurality of the 1st, the 2nd user terminal 10A, 10B.Wireless base station 20A, 20B are connected with upper station device 30, and this upper station device 30 is connected with core network 40.In addition, wireless base station 20A, 20B interconnect by wired connection or wireless connections mode.1st, in the 2nd user terminal 10A, 10B community C1, C2, can communicate with wireless base station 20A, 20B.In addition, in upper station device 30, such as comprising access gate device, radio network controller (RNC), Mobility Management Entity (MME) etc., but be not limited thereto.In addition, in minizone, by a plurality of base stations, carried out as required the control of CoMP transmission.
1st, the 2nd user terminal 10A, 10B comprise LTE terminal and LTE-A terminal, but following, as long as no mentioning especially, as the 1st, the 2nd user terminal, describe.In addition, for convenience of explanation, being made as what carry out radio communication with wireless base station 20A, 20B is the 1st, the 2nd user terminal 10A, 10B, but more generally, can be the user terminal (UE) that had not only comprised mobile terminal apparatus but also comprised fixed terminal device.
In wireless communication system 1, as wireless access way, to downlink applications OFDMA (quadrature product divide multiple access), to uplink application SC-FDMA (single carrier-frequency division multiple access), but the wireless access way of up link is not limited thereto.OFDMA is to be a plurality of narrow frequency bands (subcarrier) by dividing frequency band, and the multicarrier transmission mode that each subcarrier mapping (enum) data is communicated.SC-FDMA is divided into band system band the frequency band consisting of or continuous Resource Block to each terminal, by by a plurality of terminal utilizations different frequency band mutually, reduce the single carrier transmission mode of the interference of terminal room.
The communication channel of down link has PDSCH (physical down link sharing channel) and the descending L1/L2 control channel (PDCCH, PCFICH, PHICH) as shared downstream data channel in the 1st, the 2nd user terminal 10A, 10B.By PDSCH, transmit data and the upper control information of sending.By PDCCH (physical downlink control channel), the schedule information of transmission PDSCH and PUSCH etc.By PCFICH (Physical Control Format Indicator Channel), transmission is for the OFDM code element number of PDCCH.By PHICH (physical mixed ARQ indicating channel), transmission is for the ACK/NACK of the HARQ of PUSCH.
The communication channel of up link has as the PUSCH (physical uplink link sharing channel) of shared uplink data channels in each user terminal and as the PUCCH (physical uplink control channel) of the control channel of up link.By this PUSCH, transmission sends data and upper control information.In addition, by PUCCH, the reception quality information of communicating downlink (CQI), ACK/NACK etc.
With reference to Fig. 6, the overall structure of the wireless base station of present embodiment is described.In addition, wireless base station 20A, 20B are identical structures, therefore as wireless base station 20, describe.In addition, the 1st, the 2nd user terminal 10A described later, 10B are also identical structures, therefore as user terminal 10, describe.
Wireless base station 20 has transmission/reception antennas 201, amplifier portion 202, transmission and reception unit (notification unit) 203, base band signal process portion 204, call treatment portion 205, transmission path interface 206.By down link, from wireless base station, the 20 transmission data that send to user terminal are input to base band signal process portion 204 from upper station device 30 via transmission path interface 206.
In base band signal process portion 204, the signal of downstream data channel carried out the processing of PDCP layer, send transmission processing, the MAC (media access control) of the cutting apart of data/retransmit the rlc layers such as transmission processing of controlling in conjunction with, RLC (wireless link is controlled) retransmit control, the transmission processing of for example HARQ, scheduling, transformat selection, chnnel coding, Fast Fourier Transform Inverse (IFFT) processing, precoding processing.In addition,, for the signal of the physical downlink control channel as downlink control channel, also carry out the transmission processings such as chnnel coding, Fast Fourier Transform Inverse.
In addition, base band signal process portion 204 is by broadcast channel, and to being connected to the user terminal 10 of same cells, notice is carried out the control information of radio communication for each user terminal 10 with wireless base station 20.In the information of the communication for this community, such as comprising system bandwidth in up link or down link, for generating the identifying information (root sequence index) etc. of root sequence of signal of the random access lead code of PRACH (physical accidental access channel).
Transmission and reception unit 203 will be transformed to radio band from the baseband signal of base band signal process portion 204 outputs.Amplifier portion 202 amplifies the wireless frequency signal after frequency translation and exports to transmission/reception antennas 201.In addition, transmission and reception unit 203 forms: receiving-member, for receiving the information such as phase difference that comprise a plurality of minizones and the uplink signal of PMI; And transmit block, transmitted signal is coordinated to multiple spot and send.The effect of notification unit when in addition, transmission and reception unit 203 also plays between wireless base station is to user terminal notifying cell CSI candidate value.
On the other hand, about send to the signal of wireless base station 20 from user terminal 10 by up link, the wireless frequency signal receiving by transmission/reception antennas 201 is exaggerated device portion 202 and amplifies, after being sent out acceptance division 203 frequency translations, be transformed to baseband signal, and be input to base band signal process portion 204.
The transmission data that comprise in 204 pairs of baseband signals that receive by up link of base band signal process portion, carry out the reception & disposal that the reception & disposal controlled, rlc layer, PDCP layer are retransmitted in FFT processing, IDFT processing, error correction decoding, MAC.Signal after decoded is forwarded to upper station device 30 via transmission path interface 206.
Call treatment portion 205 communicates call treatment, the condition managing of wireless base station 20, the management of Radio Resource such as the setting of channel and release.
Fig. 7 means the module map of the structure of the base band signal process portion in the wireless base station shown in Fig. 6.Base band signal process portion 204 mainly consists of layer 1 handling part 2041, MAC handling part 2042, RLC handling part 2043, repeating transmission control detection unit 2044, CQI computing/renewal portion 2045.
Layer 1 handling part 2041 carries out the main processing relevant with physical layer.Layer 1 handling part 2041, for example to the signal receiving by up link, carries out the processing such as channel-decoding, discrete Fourier transform (DFT:Discrete Fourier Transform), frequency demapping, Fast Fourier Transform Inverse (IFFT:Inverse Fast Fourier Transform), data demodulates.In addition, 2041 pairs of signals that send by down link of layer 1 handling part, carry out the processing such as chnnel coding, Data Modulation, frequency map, Fast Fourier Transform Inverse (IFFT).
MAC handling part 2042 carry out the repeating transmission in MAC layer of the signal that receives by up link control, for the scheduling of uplink/downlink, the selection of the transformat of PUSCH/PDSCH, the processing such as selection of the Resource Block of PUSCH/PDSCH.
The grouping of 2043 pairs of groupings that receive by up link of RLC handling part/send by down link, the combination of cutting apart, dividing into groups of dividing into groups, the repeating transmission control in rlc layer etc.
Retransmit and control detection unit 2044 judgements from the repeating transmission control signal (ACK/NACK) of user terminal feedback.When feedback information is in the situation of ACK, be judged to be user terminal and suitably received signal, when feedback information is in the situation of NACK, the signal that is judged to be user terminal takes defeat, and user terminal is retransmitted to same signal.In addition, retransmit the result of judging in control detection unit 2044 and be output to CQI computing/renewal portion 2045.
The CQI (for example, CQI1, CQI2) of CQI computing/renewal portion 2045 based in each community calculates CQI jTand carry out CQI jTthe renewal of information.For example, in the situation that the CoMP of the incoherent JT type of application, the calculating formula of the variable that CQI1, the CQI2 in wireless base station utilization regulation Liao Ge community and value change according to the content of controlling the repeating transmission control signal of detection unit 2044 outputs from repeating transmission, then calculate CQI jTand upgrade.For example, wireless base station utilizes above-mentioned formula 3, then calculates CQI jTand upgrade.
In addition, in the situation that the CoMP of the relevant JT type of application, CQI1, CQI2 and the phase information (θ) of wireless base station based in each community, then calculate CQI jTand upgrade.For example, wireless base station utilizes above-mentioned formula 6, then calculates CQI jTand upgrade.
The overall structure of the user terminal of present embodiment then, is described with reference to Fig. 8.No matter be LTE terminal or LTE-A terminal, the major part structure of its hardware is identical, does not therefore distinguish explanation.User terminal 10 has transmission/reception antennas 101, amplifier portion 102, transmission and reception unit (acceptance division) 103, base band signal process portion 104, application section 105.
About the data of down link, be sent out wireless frequency signal that reception antenna 101 receives and be exaggerated device portion 102 and amplify, and be sent out acceptance division 103 frequency translations and be transformed to baseband signal.This baseband signal is carried out the reception & disposal of FFT processing, error correction decoding, repeating transmission control etc. in base band signal process portion 104.In the data of this down link, the transmission data of down link are forwarded to application section 105.Application section 105 carry out with than physical layer and the upper relevant processing of layer of MAC layer etc.In addition,, in the data of down link, broadcast message is also forwarded to application section 105.
On the other hand, the transmission data of up link are input to base band signal process portion 104 from application section 105.In base band signal process portion 104, shine upon processing, retransmit transmission processing, chnnel coding, DFT processing, the IFFT processing of controlling (HARQ).Transmission and reception unit 103 will be transformed to radio band from the baseband signal of base band signal process portion 104 outputs.After this, amplifier portion 102 amplifies the wireless frequency signal after frequency translation and sends by transmission/reception antennas 101.In addition, transmission and reception unit 103 forms: transmit block, sends to the information of phase difference, the information that connects community and selecteed PMI etc. the wireless base station eNB of a plurality of communities; And receiving-member, receiving downlink signal.
Fig. 9 means the module map of the structure of the base band signal process portion in the user terminal shown in Fig. 8.Base band signal process portion 104 mainly consists of layer 1 handling part 1041, MAC handling part 1042, RLC handling part 1043, feedback information generating unit 1044, quality information generating unit 1045, phase information generating unit 1046.
Layer 1 handling part 1041 mainly carries out the processing relevant with physical layer.Layer 1 handling part 1041, for example to the signal receiving by down link, carries out the processing such as channel-decoding, discrete Fourier transform (DFT), frequency demapping, Fast Fourier Transform Inverse (IFFT), data demodulates.In addition, 1041 pairs of signals that send by up link of layer 1 handling part, carry out the processing such as chnnel coding, Data Modulation, frequency map, Fast Fourier Transform Inverse (IFFT).
MAC handling part 1042 carries out the repeating transmission in MAC layer of the signal that receives by down link and controls the analysis of (HARQ), down dispatch information (determining of the Resource Block of the determining of the transformat of PDSCH, PDSCH) etc.In addition, MAC handling part 1042 carry out retransmitting for the MAC of the signal sending by up link control, the processing such as the analysis of uplink scheduling information (determining of the Resource Block of the determining of the transformat of PUSCH, PUSCH).
The grouping of 1043 pairs of groupings that receive by down link of RLC handling part/send by up link, the combination of cutting apart, dividing into groups of dividing into groups, the repeating transmission control in rlc layer etc.
The quality information (for example, CQI1, CQI2) that quality information generating unit 1045 generates in each community.The measured value of the quality information of Ge community of measuring is output to feedback information generating unit 1044, phase information generating unit 1046.
Phase information generating unit 1046 generates the phase information of the minizone of application CoMP.In the situation that the CoMP of the relevant JT type of application, user terminal is considered the CQI in wireless base station jTrenewal value (CQI update) composite value (CQI of CQI of He Ge community aggregated) maximum, determine phase information.In addition, now, can be in quality information generating unit 1045 or phase information generating unit 1046 CQI based on each community and calculate renewal value (CQI update) and (CQI aggregated).
Specifically, first user terminal selects the composite value (CQI of the CQI of each community aggregated) and renewal value (CQI update) the absolute value phase information (1st step) less than setting (XdB) of difference.Then, from the phase information of this selection, select the composite value (CQI of CQI aggregated) become maximum specific phase information (the 2nd step).The specific phase information determining in phase information generating unit 1046 is output to feedback information generating unit 1044.
Feedback information generating unit 1044 generates feedback information (CSI).As CSI, can enumerate CSI (PMI, CDI, CQI), phase information, RI (order designator) of each community etc.In addition generate for representing whether user terminal has suitably received the repeating transmission control signal (ACK/NACK) of data-signal.These signals that generate in feedback control information generating unit 1044 feed back to wireless base station by PUCCH and PUSCH.
In the situation of CoMP of applying incoherent JT type, the repeating transmission control signal of detection unit 2044 based on from user terminal feedback controlled in the repeating transmission of wireless base station, judges whether user terminal has suitably received data (ACK/NACK).In addition, the CQI of the CQI of base station computing/renewal portion 2045 based in each community, calculates CQI jTand carry out CQI jTthe renewal of information.Now, wireless base station can utilize the calculating formula (for example, above-mentioned formula 3) that comprises the variable that value changes according to the result of retransmitting control signal, carries out CQI jTrenewal.
In addition,, in the situation that the CoMP of the relevant JT type of application, user terminal feeds back to wireless base station by the phase information generating in phase information generating unit 1046.CQI and the phase information of CQI computing/renewal portion 2045 of wireless base station based in each community, carries out CQI jTrenewal.In addition, now, can utilize and comprise value according to for example, from retransmit controlling β that the result of detection unit 2044 outputs changes and/or the calculating formula (, above-mentioned formula 6) of cos (θ), carry out CQI jTrenewal.
Above, utilize above-mentioned execution mode to describe the present invention in detail, but to those skilled in the art, the execution mode that the present invention is not limited to illustrate in this specification is clear and definite.The present invention can not depart from aim of the present invention and the scope by the record decision of claims, as modification and alter mode, implements.Thereby the record of this specification be take and illustrated as object, and the present invention is not had to any restrictive meaning.
The Patent 2012-060788 of the application based on application on March 16th, 2012.Its content is all included in this.

Claims (11)

1. a wireless base station, can coordinate multiple spot to user terminal and send reception, it is characterized in that having:
Detection unit, judges from the repeating transmission control signal of described user terminal feedback; And
CQI renewal portion, utilizes the reception quality information in each community, and upgrade for coordinating multiple spot and send the CQI receiving,
Described CQI renewal portion utilizes calculating formula, upgrades described CQI, and the variable that the reception quality information in described calculating formula You Ge community and numerical value change according to the content of retransmitting control signal is stipulated.
2. wireless base station as claimed in claim 1, is characterized in that, described CQI renewal portion is as described calculating formula, application specifies the following formula 11 of the β that changes according to the content of retransmitting control signal of numerical value,
[mathematical expression 10]
(formula 11)
CQI JT = CQI 1 + CQI 2 + &beta; * CQI 1 * CQI 2
Wherein, CQI1 is the reception quality information in the CoMP community that received power is the strongest, and CQI2 is the reception quality information in the CoMP community of received power the last the second, and β is variable.
3. wireless base station as claimed in claim 2, is characterized in that,
Described CQI renewal portion increases the value of described variable β in the situation that described repeating transmission control signal is ACK, reduces the value of described variable β in the situation that described repeating transmission control signal is NACK.
4. a wireless base station, can coordinate multiple spot to user terminal and send reception, it is characterized in that having:
Detection unit, judges from the repeating transmission control signal of described user terminal feedback; And
CQI renewal portion, the phase information that utilizes the reception quality information in each community and feed back from described user terminal, upgrades for coordinating multiple spot and sends the CQI receiving,
Described phase information is considered the composite value (CQI of the quality of reception in each community in described user terminal aggregated) and for coordinating the renewal value (CQI of the CQI of multiple spot transmission reception update) difference value and determine.
5. wireless base station as claimed in claim 4, is characterized in that,
Described CQI renewal portion is as described calculating formula, the formula 12 that application is following,
[mathematical expression 11]
(formula 12)
CQI JT = CQI 1 + CQI 2 + &beta; * CQI 1 * CQI 2 * cos ( &theta; )
Wherein, CQI1 is the reception quality information in the CoMP community that received power is the strongest, and CQI2 is the reception quality information in the CoMP community of received power the last the second, and β is fixed value or variable, and θ is phase information.
6. wireless base station as claimed in claim 5, is characterized in that,
Described CQI renewal portion is according to the content of described repeating transmission control signal, changes wherein one or two the value of β and cos (θ).
7. wireless base station as claimed in claim 6, is characterized in that,
Described CQI renewal portion increases wherein one or two the value of described β and cos (θ) in the situation that described repeating transmission control signal is ACK, in the situation that described repeating transmission control signal is NACK, reduce wherein one or two the value of described β and cos (θ).
8. a user terminal, can coordinate multiple spot with a plurality of wireless base stations and send reception, it is characterized in that having:
Quality information generating unit, generates the reception quality information in each community;
Retransmit control signal generating unit, can judgement receive the data-signal sending from described wireless base station, thereby generate, retransmits control signal;
Phase information generating unit, the phase information of generation minizone; And
Transmission and reception unit, to retransmitting control signal described in major general and described phase information feeds back to wireless base station,
Described phase information generating unit is considered the composite value (CQI of the quality of reception of each community aggregated) and for coordinating the renewal value (CQI of the CQI of multiple spot transmission reception update) difference value, determine described phase information.
9. user terminal as claimed in claim 8, is characterized in that,
Described phase information generating unit is selected the composite value (CQI of the quality of reception of described each community aggregated) and the described renewal value (CQI that sends the CQI receiving for coordinating multiple spot update) the absolute value of difference value be less than a plurality of phase informations of setting, and from selected a plurality of phase informations, select the composite value (CQI of the described quality of reception aggregated) become maximum phase information.
10. a wireless communications method, for a plurality of wireless base stations and can coordinate multiple spot with described a plurality of wireless base stations and send the user terminal receiving, is characterized in that having:
Described user terminal generates the step of the reception quality information in each community;
Can judgement receive the data-signal sending from described wireless base station, thereby generate the step of retransmitting control signal; And
To the step of retransmitting control signal described in major general and feed back to described wireless base station;
And described wireless communications method has:
The step of the repeating transmission control signal being fed is judged in described wireless base station; And
Utilize the reception quality information in each community, upgrade the step that sends the CQI receiving for coordinating multiple spot,
In the renewal of described CQI, utilize the calculating formula of the variable regulation that reception quality information in You Ge community and numerical value changes according to the content of retransmitting control signal.
11. 1 kinds of wireless communication systems, have a plurality of wireless base stations and can coordinate the user terminal that multiple spot sends reception with described a plurality of wireless base stations, it is characterized in that,
Described user terminal has:
Quality information generating unit, generates the reception quality information in each community;
Retransmit control signal generating unit, can judgement receive the data-signal sending from described wireless base station, generates and retransmit control signal; And
Transmission and reception unit, feeds back to described wireless base station to retransmitting control signal described in major general,
Described wireless base station has:
Detection unit, judges from the repeating transmission control signal of described user terminal feedback; And
Renewal portion, utilizes the reception quality information in each community, and upgrade for coordinating multiple spot and send the CQI receiving,
Described CQI renewal portion utilizes calculating formula to upgrade described CQI, the variable regulation that the reception quality information in described calculating formula You Ge community and numerical value change according to the content of retransmitting control signal.
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